package com.xds.gulimall.search.service.imp;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.xds.common.to.es.SkuEsModel;
import com.xds.common.utils.R;
import com.xds.gulimall.search.config.ElasticSearchConfig;
import com.xds.gulimall.search.constant.EsConstant;
import com.xds.gulimall.search.feign.ProductFeignService;
import com.xds.gulimall.search.service.MallSearchService;
import com.xds.gulimall.search.vo.AttrRespVo;
import com.xds.gulimall.search.vo.BrandVo;
import com.xds.gulimall.search.vo.SearchParam;
import com.xds.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author : baixu
 * @date : 10:50 2021/12/17
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;
    @Override
    /**
     * 检索的所有参数 最终返回检索的结果
     */
    public SearchResult search(SearchParam param) {
        //1.动态构建出查询需要的DSL语句
        SearchResult result=null;
         //准备检索请求
        SearchRequest searchRequest= buildSearchRequest(param);

        try {
            //执行检索请求
            SearchResponse response = client.search(searchRequest, ElasticSearchConfig.COMMON_OPTIONS);
            //分析响应数据 封装成需要的格式
           result= buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 封装结构数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        //1. 返回的所有商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels=new ArrayList<>();
        if (hits.getHits()!=null&&hits.getHits().length>0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel= JSON.parseObject(sourceAsString,SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String title = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(title);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //2.当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos=new ArrayList<>();
        for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));//设置分类id
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);//分类名字
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //3.当前商品所涉及的品牌信息
        List<SearchResult.BrandVo> brandVos=new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //品牌id
            brandVo.setBrandId(bucket.getKeyAsNumber().longValue());
            //品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4。当前商品所涉及的所有属性信息
        List<SearchResult.AttrVo> attrVos=new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);//属性id
            //属性名
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //属性值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);
            result.getAttrIds().add(attrId);
//            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);


        //5.当前商品分页信息
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        int totalPages=(int) total%EsConstant.PAGE_SIZE==0?(int)total/EsConstant.PAGE_SIZE:(int)(total/EsConstant.PAGE_SIZE+1);
        result.setTotalPages(totalPages);
        result.setPageNum(param.getPageNum());
        List<Integer> pageNavs=new ArrayList<>();
        for (int i = 1; i < totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1.分析每一个attrs传过来的参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.info(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrRespVo data = r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2.取消了面包屑以后 我们跳转到哪个地方
                //拿到所有的查询条件，去掉当前
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.xiaowenplus.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());


            result.setNavs(collect);
        }
        //品牌 分类 面包屑导航
        if (param.getBrandId()!=null&&param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo vo = new SearchResult.NavVo();
            vo.setNavName("品牌");
            //远程调用 查询品牌信息
            R r = productFeignService.brandInfo(param.getBrandId());
           if (r.getCode()==0){
               List<BrandVo> brandVo = r.getData("brand", new TypeReference<List<BrandVo>>() {
               });
               StringBuffer buffer=new StringBuffer();
               String replace="";
               for (BrandVo brand : brandVo) {
                   buffer.append(brand.getBrandName()+";");
                    replace = replaceQueryString(param, brand.getBrandId()+"","brandId");
               }
               vo.setNavName(buffer.toString());
               vo.setLink("http://search.xiaowenplus.com/list.html?" + replace);
           }

            navs.add(vo);
        }


        return result;
    }

    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode.replace("+", "%20");  //浏览器对空格的编码和Java不一样，差异化处理
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.get_queryString().replace("&"+key+"=" + value, "");
        return replace;
    }


    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建dsl语句
        SearchSourceBuilder sourceBuilder=new SearchSourceBuilder();
        /**
         * 模糊匹配 过滤(按照属性，分类，品牌，价格区间，库存)
         */
         //构建boolquery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //must模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //过滤 按照三级分类id查询
        if (param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //过滤 按照品牌id进行查询
        if (param.getBrandId()!=null&&param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //过滤 按照是否有库存来查询
        if (param.getHasStock()!=null){

            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }
        //过滤 按照价格区间检索
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] price = param.getSkuPrice().split("_");
            if (price.length==2){
                rangeQuery.gte(price[0]).lte(price[1]);

            } else if(price.length==1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(price[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(price[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }
        //过滤 按照属性查询
        if (param.getAttrs()!=null&&param.getAttrs().size()>0){
            for (String attr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attr.split("_");
                   String attrId=s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个都要生成nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //把所有查询条件都拿来进形封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序 分页 高亮
         */
        //排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sorts = param.getSort();
            String[] sort = sorts.split("_");
            SortOrder order=sort[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(sort[0], order);
        }
        //分页
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PAGE_SIZE);
        sourceBuilder.size(EsConstant.PAGE_SIZE);
        //高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle").preTags("<b style='color:red'>").postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }
        /**
         * 聚合分析
         */
        //品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);
        //分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);
        //属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合分析出当前attr_id所对应的名字
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合分析出当前attr_id对应所有可能属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);
        String dsl = sourceBuilder.toString();
        System.out.println("构建的dsl语句"+dsl);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
      }
   }

